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FAIR VALUE MEASUREMENT - Recurring basis (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 GBP (£) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Commodity hedge |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Term of swap contract | 2 years |  |
Derivative asset |  |  | $ 3,416,000
Interest rate swap | Designated as hedging instruments | Cash flow hedge |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Number of financial institutions | item | 2 |  |
Notional amount | £ 78,400,000.00000 | $ 96,800,000 |
Derivative notional amount |  | 399,000,000.00000 |
Recurring basis | Significant Other Observable Inputs (Level 2) |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Total assets |  | 7,977,000 | 27,111,000
Total liabilities |  | 13,698,000 | 6,480,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Foreign exchange forward contracts |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Total assets |  | 4,166,000 | 12,316,000
Total liabilities |  | 13,480,000 | 5,121,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Foreign exchange option contracts |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Total assets |  | 1,000 |
Total liabilities |  | 218,000 |
Recurring basis | Significant Other Observable Inputs (Level 2) | Commodity hedge |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Total assets |  |  | 3,416,000
Recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate swap |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Total assets |  | 3,810,000 | 11,379,000
Total liabilities |  |  | 1,359,000
Total Fair Value and Carrying Value on the Balance Sheets | Recurring basis |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Total assets |  | 7,977,000 | 27,111,000
Total liabilities |  | 13,698,000 | 6,480,000
Total Fair Value and Carrying Value on the Balance Sheets | Recurring basis | Foreign exchange forward contracts |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Total assets |  | 4,166,000 | 12,316,000
Total liabilities |  | 13,480,000 | 5,121,000
Total Fair Value and Carrying Value on the Balance Sheets | Recurring basis | Foreign exchange option contracts |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Total assets |  | 1,000 |
Total liabilities |  | 218,000 |
Total Fair Value and Carrying Value on the Balance Sheets | Recurring basis | Commodity hedge |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Total assets |  |  | 3,416,000
Total Fair Value and Carrying Value on the Balance Sheets | Recurring basis | Interest rate swap |  |  |
Fair value measurements of the entity's assets or liabilities that are measured at fair value on a recurring basis |  |  |
Total assets |  | $ 3,810,000 | 11,379,000
Total liabilities |  |  | $ 1,359,000

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